Since the auto has a torque convertor in between, it should be smoother. But then again, the Euro manual is already pretty smooth in stock form that the vibrations you feel are from the tyres contacting the road.
In my Euro manual, at 2000-2100rpm, there is a strange subtle vibration that goes through the entire cabin. Noticeable when you have 2 keys touching each other on your keyring and they start to vibrate.